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Income Taxes Income Taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Income Tax Contingency [Line Items] |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Provisional Income Tax Expense |  | $ 48
Tax Cuts and Jobs Act of 2017, Indirect Impact on Inventory, Income Tax Expense |  | $ 16
Repatriation Accrual [Member] |  |
Income Tax Contingency [Line Items] |  |
Other Tax Expense (Benefit) | $ 13 |
Internal Entity Restructuring [Member] |  |
Income Tax Contingency [Line Items] |  |
Other Tax Expense (Benefit) | $ (102) |

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